




'''simple docstring'''







lowerCAmelCase_     						=				[0, 2, 4, 6, 8]
lowerCAmelCase_     						=				[1, 3, 5, 7, 9]







def 						_A      ( UpperCAmelCase      ,UpperCAmelCase      ,UpperCAmelCase      ,UpperCAmelCase						):






   '''simple docstring'''







   if remaining_length == 0:
      if digits[0] == 0 or digits[-1] == 0:
         return 0

      for i in range(length // 2 - 1      ,-1      ,-1						):
         remainder += digits[i] + digits[length - i - 1]

         if remainder % 2 == 0:
            return 0

         remainder //= 10

      return 1

   if remaining_length == 1:
      if remainder % 2 == 0:
         return 0

      A__       =     0
      for digit in range(10						):
         A__       =     digit
         result += reversible_numbers(
             0      ,(remainder + 2 * digit) // 10      ,UpperCAmelCase      ,UpperCAmelCase						)
      return result

   A__       =     0
   for digita in range(10						):
      A__       =     digita

      if (remainder + digita) % 2 == 0:
         A__       =     ODD_DIGITS
      else:
         A__       =     EVEN_DIGITS

      for digita in other_parity_digits:
         A__       =     digita
         result += reversible_numbers(
             remaining_length - 2      ,(remainder + digita + digita) // 10      ,UpperCAmelCase      ,UpperCAmelCase      ,)
   return result







def 						_A      ( UpperCAmelCase = 9						):






   '''simple docstring'''







   A__       =     0
   for length in range(1      ,max_power + 1						):
      result += reversible_numbers(UpperCAmelCase      ,0      ,[0] * length      ,UpperCAmelCase						)
   return result


if __name__ == "__main__":
    print(f'''{solution() = }''')








'''simple docstring'''







def 						_A      ( UpperCAmelCase						):






   '''simple docstring'''







   A__       =     0
   while num > 0:
      digit_sum += num % 10
      num //= 10
   return digit_sum







def 						_A      ( UpperCAmelCase = 100						):






   '''simple docstring'''







   A__       =     1
   A__       =     2

   for i in range(2      ,max_n + 1						):
      A__       =     pre_numerator
      A__       =     2 * i // 3 if i % 3 == 0 else 1
      A__       =     cur_numerator
      A__       =     e_cont * pre_numerator + temp

   return sum_digits(UpperCAmelCase						)


if __name__ == "__main__":
    print(f'''{solution() = }''')


